import { test } from 'node:test';
import assert from 'node:assert/strict';
import { signal } from '../../YouleNexus/assets/framework/core/reactive.ts';

test('signal: value 读写', () => {
  const s = signal(1);
  assert.equal(s.value, 1);
  s.value = 2;
  assert.equal(s.value, 2);
});

test('signal: subscribe 收到 (value, prev)', () => {
  const s = signal(1);
  let got: [number, number] | null = null;
  s.subscribe((v, p) => { got = [v, p]; });
  s.value = 5;
  assert.deepEqual(got, [5, 1]);
});

test('signal: 退订后不再收到', () => {
  const s = signal(0);
  let count = 0;
  const un = s.subscribe(() => { count++; });
  s.value = 1;
  un();
  s.value = 2;
  assert.equal(count, 1);
});

test('signal: Object.is 判等，值未变不通知', () => {
  const s = signal(7);
  let count = 0;
  s.subscribe(() => { count++; });
  s.value = 7;
  assert.equal(count, 0);
});

test('signal: 一个订阅者抛错不影响其它', () => {
  const s = signal(0);
  let reached = false;
  s.subscribe(() => { throw new Error('boom'); });
  s.subscribe(() => { reached = true; });
  s.value = 1;
  assert.equal(reached, true);
});